Translation: "MASS DISTRIBUTION HOUSE - QUELLE - FURTH IN BAVARIA - FORWARD HUMIDITY PROTECTION"
All I found: Quelle
Humongous German mail order etc. store, has for a long time sold consumer electronics under their own Universum brand, today this trademark is only used for their budget lines of AV and portable audio sourced from the usual parts of the world but in the 80's they had lines of hi-fi seperates and although these where mostly budget products, some of them where quite presentable especially considering price etc. Nothing about old models.
These days they seem to be a mail order department store like Sears or JC Penny. Their site:
http://www.quelle.de/is-bin/INTERSHO...orefront-Start